JP2007114581A - 粘着型位相差層付偏光板、その製造方法、光学フィルムおよび画像表示装置 - Google Patents
粘着型位相差層付偏光板、その製造方法、光学フィルムおよび画像表示装置 Download PDFInfo
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- JP2007114581A JP2007114581A JP2005307376A JP2005307376A JP2007114581A JP 2007114581 A JP2007114581 A JP 2007114581A JP 2005307376 A JP2005307376 A JP 2005307376A JP 2005307376 A JP2005307376 A JP 2005307376A JP 2007114581 A JP2007114581 A JP 2007114581A
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Abstract
【解決手段】 ヨウ素系偏光子(1)の両面に透明保護フィルムが積層されている偏光板(2)の少なくとも片面の透明保護フィルムに、位相差層を有する位相差層付偏光板(3)に、さらに当該位相差層側にアクリル系粘着剤層を積層した粘着型位相差層付偏光板(4)であって、ヨウ素系偏光子(1)は、偏光子中のヨウ素(I)の含有量(重量%)とカリウム(K)の含有量(重量%)の比(K/I)が0.200〜0.235であって、偏光板(2)は、ヨウ素系偏光子(1)と透明保護フィルムとが、アセトアセチル基を含有するポリビニルアルコール樹脂および架橋剤を含有する水溶性接着剤により形成された接着剤層によって積層されている。
【選択図】 図1
Description
ヨウ素系偏光子(1)は、偏光子中のヨウ素(I)の含有量(重量%)とカリウム(K)の含有量(重量%)の比(K/I)が0.200〜0.235であって、
偏光板(2)は、ヨウ素系偏光子(1)と透明保護フィルムとが、アセトアセチル基を含有するポリビニルアルコール樹脂および架橋剤を含有する水溶性接着剤により形成された接着剤層によって積層されており、
位相差層付偏光板(3)は、80℃で、24時間放置した後に測定した、吸収軸方向における下記式で示される寸法収縮率が0.5%以下であり、
寸法収縮率(%)=<{(放置前の寸法)−(放置後の寸法)}/(放置前の寸法)>×100、
粘着型位相差層付偏光板(4)は、単体透過率が41.0〜43.2%であることを特徴とする粘着型位相差層付偏光板、に関する。
位相差層付偏光板(3)に、60〜450N/mの張力をかけた状態で、加熱温度60〜120℃の条件で加熱処理を施す工程、
次いで、前記加熱処理された位相差層付偏光板(3)の位相差層側にアクリル系粘着剤層を積層する工程、
を有することを特徴とする粘着型位相差層付偏光板の製造方法、に関する。
偏光子中のヨウ素(I)の含有量(重量%)とカリウム(K)の含有量(重量%)について、蛍光X線分析を行い、前記含有量を測定した。測定結果から、元素含有比(K/I)を求めた。
測定装置:蛍光X線分析装置ZSX100e,理学電気工業株式会社製
X線光源:Rh
出力:40kV,90mA
測定径:10mmφ
雰囲気:真空
測定方法:薄膜標準試料を用い、偏光子の厚みおよびB含有量を固定値として定量分析を行った。
位相差層付偏光板を、一方の辺が、吸収軸方向と平行になるように正方形試験片(10cm×10cm)に切り出した。偏光子の吸収軸方向と平行になるように、試験片の端辺中央部にそれぞれカッターで切り込みを入れ、その切込み間隔(放置前の寸法)をノギスで測定した。そして、試験片を80℃で、24時間放置した後に測定した、切込み間隔(放置後の寸法)を測定した。これらの結果から、下記式により寸法収縮率(%)を求めた。
寸法収縮率(%)=<{(放置前の寸法)−(放置後の寸法)}/(放置前の寸法)>×100。
偏光子および粘着型位相差層付偏光板について、積分球付き分光光度計(日立製作所製のU−4100)にて測定した。各直線偏光に対する透過率はグラントムソンプリズム偏光子を通して得られた完全偏光を100%として測定した。なお、透過率は、CIE1931表色系に基づいて算出した、視感度補正したY値で示した。k1は最大透過率方向の直線偏光の透過率、k2はその直交方向の直線偏光の透過率を表す。単体透過率Tは、T=(k1+k2)/2、で算出した。
(偏光子)
平均重合度2400、ケン化度99.9モル%の厚さ75μmのポリビニルアルコールフィルムを、30℃の温水中に60秒間浸漬し膨潤させた。次いで、ヨウ素/ヨウ化カリウム(重量比=1/7)の濃度0.4%のヨウ素水溶液中に浸漬し、延伸倍率が3.5倍になるようにフィルム延伸しながら染色した。その後、65℃のホウ酸エステル水溶液中で、総延伸倍率が6倍となるように延伸を行い、さらにヨウ化カリウム濃度3%の水溶液に30℃で5秒間浸漬した。延伸後に、40℃のオーブンで3分間乾燥を行い、偏光子を得た。偏光子の単体透過率は42.4%であった。
厚さ80μmのトリアセチルセルロースフィルムを用いた。
富士写真フイルム社製のワイドビューフィルムSAを用いた。当該ワイドビューフィルムSAは、トリアセチルセルロース基材フィルム上に、架橋性ポリビニルアルコールよりなく配向膜を介して紫外線硬化製のディスコティック液晶化合物より形成した配向液晶層を固定したものである。
アセトアセチル基を含有するポリビニルアルコール樹脂(平均重合度1200,ケン化度98.5モル%,アセトアセチル化度5モル%)100部に対し、メチロールメラミン32部を、30℃の温度条件下に、純水に溶解し、固形分濃度4%になるように調整した接着剤水溶液を作製した。
上記透明保護フィルム(トリアセチルセルロースフィルム)の片面に、上記接着剤を乾燥後の接着剤層の厚みが80nmとなるように塗布した。一方、位相差層付透明保護フィルムは、配向液晶層を形成していない側のトリアセチルセルロース基材フィルム上に、上記接着剤を乾燥後の接着剤層の厚みが80nmとなるように塗布した。各接着剤の塗布は、その調整から30分間後に30℃の温度条件下で行った。次いで、30℃の温度条件下で、偏光子の両面に、上記透明保護フィルムおよび位相差層付透明保護フィルムをロール機で貼り合わせた後、張力100N/mをかけた状態で、70℃で5分間乾燥して、位相差層付偏光板を得た。位相差層付偏光板の寸法収縮率0.39%であった。
冷却管、窒素導入管、温度計及び撹拌装置を備えた反応容器に、アクリル酸ブチル99部、アクリル酸4−ヒドロキシブチル1.0部および2,2´−アゾビスイソブチロニトリル0.3部を酢酸エチルと共に加えて窒素ガス気流下、60℃で4時間反応させた後、その反応液に酢酸エチルを加えて、重量平均分子量165万のアクリル系ポリマーを含有する溶液(固形分濃度30%)を得た。前記アクリル系ポリマー溶液の固形分100部あたり0.15部のジベンゾイルパーオキシド(日本油脂製(株):ナイパーBO−Y)と、0.02部のトリメチロールプロパンキシレンジイソシアネート(三井武田ケミカル(株):タケネートD110N)と、0.2部のシランカップリング剤(綜研化学株式会社製:A−100,アセトアセチル基含有シランカップリング剤)を配合して、アクリル系粘着剤を得た。
上記粘着剤を、シリコーン系剥離剤で表面処理したポリエステルフィルムからなるセパレータに塗工し155℃で3分間加熱処理して厚さ20μmの粘着剤層を得た。上記位相差層付偏光板の配向液晶層に、粘着剤層を形成したセパレータを移着させ、粘着型位相差層付偏光板を作製した。なお、粘着剤層のゲル分率は60重量%であった。
(偏光子)
実施例1において、ヨウ素水溶液の濃度を0.37%に変えて、得られる偏光子の単体透過率が、43.2%になるように変えたこと以外は実施例1と同様にして偏光子を得た。
(粘着剤の調製)
ブチルアクリレート95部、アクリル酸5部、2−ヒドロキシエチルアクリレート0.1部、および2,2−アゾビスイソブチロニトリル0.05部と酢酸エチル200部を、窒素導入管、冷却管を備えた4つ口フラスコに投入し、充分に窒素置換した後、窒素気流下で撹拌しながら55℃で20時間重合反応を行い、重量平均分子量157万のアクリルポリマーを得た。前記アクリル系ポリマー溶液の固形分100部に対して、3−グリシドキシプロピルトリメトキシシラン0.08部、さらに架橋剤としてトリメチロールプロパンのトリレンジイソシアネート付加物からなるポリイソシアネート系架橋剤0.8部を均一に混合してアクリル系粘着剤を得た。
上記粘着剤を、シリコーン系剥離剤で表面処理したポリエステルフィルムからなるセパレータに塗工し130℃で3分間加熱処理して厚さ25μmの粘着剤層を得た。実施例1の位相差層付偏光板の配向液晶層に、上記粘着剤層を形成したセパレータを移着させ、粘着型位相差層付偏光板を作製した。なお、粘着剤層のゲル分率は6重量%であった。
(偏光子)
実施例1において、ヨウ素水溶液の濃度を0.35%に変えて、得られる偏光子の単体透過率が、44.3%になるように変えたこと以外は実施例1と同様にして偏光子を得た。
(ポリビニルアルコール系接着剤)
ポリビニルアルコール樹脂(平均重合度1800,ケン化度98.5モル%)100部に対し、メチロールメラミン25部を、30℃の温度条件下に、純水に溶解し、固形分濃度4%になるように調整した接着剤水溶液を作製した。
(位相差層付偏光板の作製)
実施例1の位相差層付偏光板の作製において、偏光子の両面に、上記透明保護フィルムおよび位相差層付透明保護フィルムをロール機で貼り合わせた後、張力(500N/m)をかけた状態で、70℃で5分間乾燥したこと以外は実施例1と同様にして、位相差層付偏光板を得た。位相差層付偏光板の寸法収縮率は0.60%であった。
(偏光子)
平均重合度2400、ケン化度99.9モル%の厚さ75μmのポリビニルアルコールフィルムを、30℃の温水中に60秒間浸漬し膨潤させた。次いで、ヨウ素/ヨウ化カリウム(重量比=1/7)の濃度0.4%のヨウ素水溶液中に浸漬し、延伸倍率が3.5倍になるようにフィルム延伸しながら染色した。その後、65℃のホウ酸エステル水溶液中で、総延伸倍率が6倍となるように延伸を行い、さらにヨウ化カリウム濃度5%の水溶液に30℃で5秒間浸漬した。延伸後に、40℃のオーブンで3分間乾燥を行い、偏光子を得た。偏光子の単体透過率は42.2%であった。
実施例および比較例で得られた偏光子、位相差層付偏光板、粘着型位相差層付偏光板について下記物性を測定し、また粘着型位相差層付偏光板について下記評価を行なった。結果を表1に示す。
粘着型位相差層付偏光板(100mm×100mm)を、100℃で500時間の環境下に放置した後、クロスニコル状態で目視観察し、以下の基準で評価した。
○:赤みがかって見えない場合。
×:赤みがかって見える場合。
粘着型位相差層付偏光板(50mm×25mm)を、60℃のお湯に浸漬し、2時間経過した後、フィルム端部に偏光子の収縮の状態を目視観察し、以下の基準で評価した。
○:端部から2mm以上の収縮が見られない。
×:端部から2mmを超える収縮が見られる。
粘着型位相差層付偏光板を、液晶パネルの表示部サイズに合わせて、粘着剤層面を下にした状態で、偏光板の吸収軸が45°となるように切り出し、市販のTN液晶パネル(19インチサイズ)に、液晶パネルの両面に偏光板の吸収軸が直交するように配置した状態で実装した後、80℃で500時間点灯した後、黒表示した際の表示の不均一性を目視観察し、以下の基準で評価した。
○:パネル周辺部でのムラが視認できない場合。
×:パネル周辺部に明らかにムラが視認される場合。
粘着型位相差層付偏光板(200mm×300mm)を、ガラス板に貼り合わせた後、−40℃に1時間放置と80℃に1時間放置の環境変化を、200回繰り返した後、外観上の変化を目視観察し、以下の基準で評価した。
○:外観上に大きな変化が見られない場合。
×:外観上の変化(端部での剥がれや、粘着剤の発泡など)が明らかに見られる場合。
2 偏光板
21、22 透明保護フィルム
23、24 ポリビニルアルコール系接着剤層
3 位相差層付偏光板
31 アクリル系粘着剤層
4 粘着型位相差層付偏光板
5 セパレータ
Claims (13)
- ヨウ素系偏光子(1)の両面に透明保護フィルムが積層されている偏光板(2)の少なくとも片面の透明保護フィルムに、位相差層を有する位相差層付偏光板(3)に、さらに当該位相差層側にアクリル系粘着剤層を積層した粘着型位相差層付偏光板(4)であって、
ヨウ素系偏光子(1)は、偏光子中のヨウ素(I)の含有量(重量%)とカリウム(K)の含有量(重量%)の比(K/I)が0.200〜0.235であって、
偏光板(2)は、ヨウ素系偏光子(1)と透明保護フィルムとが、アセトアセチル基を含有するポリビニルアルコール樹脂および架橋剤を含有する水溶性接着剤により形成された接着剤層によって積層されており、
位相差層付偏光板(3)は、80℃で、24時間放置した後に測定した、吸収軸方向における下記式で示される寸法収縮率が0.5%以下であり、
寸法収縮率(%)=<{(放置前の寸法)−(放置後の寸法)}/(放置前の寸法)>×100、
粘着型位相差層付偏光板(4)は、単体透過率が41.0〜43.2%であることを特徴とする粘着型位相差層付偏光板。 - 位相差層付偏光板(3)は、透明保護フィルムに、液晶材料をコーティングすることにより位相差層を塗設し、または、別途、液晶材料をコーティングすることにより形成した位相差層を透明保護フィルムに転写により配置し、透明保護フィルムと位相差層が一体化したものであることを特徴とする請求項1記載の粘着型位相差層付偏光板。
- 位相差層が、ディスコティック液晶の傾斜配向層を固定したものであることを特徴とする請求項2記載の粘着型位相差層付偏光板。
- 粘着型位相差層付偏光板(4)における、アクリル系粘着剤層が、(メタ)アクリル系ポリマー(A)および架橋剤を含有してなるアクリル系粘着剤を架橋反応させて形成したものであることを特徴とする請求項1〜3のいずれかに記載の粘着型位相差層付偏光板。
- (メタ)アクリル系ポリマー(A)が、アルキル(メタ)アクリレート(a1)100重量部に対して、水酸基含有(メタ)アクリル系モノマー(a2)0.01〜5重量部を共重合成分として含有してなることを特徴とする請求項4記載の粘着型位相差層付偏光板。
- アクリル系粘着剤が、(メタ)アクリル系ポリマー(A)100重量部に対して、架橋剤として、過酸化物(B)0.02〜2重量部を含有してなることを特徴とする請求項4または5記載の粘着型位相差層付偏光板。
- アクリル系粘着剤が、(メタ)アクリル系ポリマー(A)100重量部に対して、架橋剤として、イソシアネート系化合物(C)0.001〜2重量部を含有してなることを特徴とする請求項4または5記載の粘着型位相差層付偏光板。
- アクリル系粘着剤が、(メタ)アクリル系ポリマー(A)100重量部に対して、架橋剤として、過酸化物(B)0.02〜2重量部およびイソシアネート系化合物(C)0.001〜2重量部を含有してなることを特徴とする請求項4または5記載の粘着型位相差層付偏光板。
- アクリル系粘着剤が、さらにシランカップリング剤を含有してなること特徴とする請求項4〜8のいずれかに記載の粘着型位相差層付偏光板。
- アクリル系粘着剤層は、アンカーコート層を介して位相差層に積層されていることを特徴とする請求項1〜9のいずれかに記載の粘着型位相差層付偏光板。
- 請求項1〜10のいずれかに記載の、ヨウ素系偏光子(1)の両面に透明保護フィルムが積層されている偏光板(2)の少なくとも片面の透明保護フィルムに、位相差層を有する位相差層付偏光板(3)に、さらに当該位相差層側にアクリル系粘着剤層を積層した粘着型位相差層付偏光板(4)であって、
位相差層付偏光板(3)に、60〜450N/mの張力をかけた状態で、加熱温度60〜120℃の条件で加熱処理を施す工程、
次いで、前記加熱処理された位相差層付偏光板(3)の位相差層側にアクリル系粘着剤層を積層する工程、
を有することを特徴とする粘着型位相差層付偏光板の製造方法。 - 請求項1〜10のいずれかに記載の粘着型位相差層付偏光板が用いられていることを特徴とする光学フィルム。
- 請求項1〜10のいずれかに記載の粘着型位相差層付偏光板または請求項12記載の光学フィルムが用いられていることを特徴とする画像表示装置。
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JP2009294607A (ja) * | 2008-06-09 | 2009-12-17 | Sumitomo Chemical Co Ltd | 粘着剤層付位相差フィルム、それを用いた楕円偏光板および液晶表示装置 |
WO2010002198A3 (ko) * | 2008-07-01 | 2010-05-06 | (주)Lg화학 | 점착제 조성물, 편광판용 보호 필름, 편광판 및 액정표시장치 |
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JP2019206726A (ja) * | 2019-09-12 | 2019-12-05 | 藤森工業株式会社 | 粘着剤層及び粘着フィルム |
JP2019211799A (ja) * | 2019-09-24 | 2019-12-12 | 日東電工株式会社 | 偏光板の製造方法 |
JP2020149059A (ja) * | 2020-05-16 | 2020-09-17 | 日東電工株式会社 | 光学積層体およびその製造方法、ならびに該光学積層体を用いた画像表示装置 |
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KR100889717B1 (ko) | 2009-03-23 |
WO2007046223A1 (ja) | 2007-04-26 |
CN101080657A (zh) | 2007-11-28 |
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KR20070088581A (ko) | 2007-08-29 |
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